Shell for deflection yokes



1951 A. P. HULTGREN 2,563,115

SHELL FOR DEFLECTION YOKES Filed June 10, 1950 I L =J,

Patented Aug. 7, 1951 UNITED STATES PATENT OFFICE slim roa oar-memos rons Arnold P. Hultgren, River Forest, 111., assignor to American Molded Products 00.,Chieago, 111., a corporation of Illinois v Application June in, 1950, Serial No. 187,291

7 Claims. (CL 313-75) 1 This invention relates to a shell for a deflection yoke oi the type adapted for use in television receiving apparatus. More particularly, the

' present invention is directed to a deflection yoke semi-circular contour, adapted to be firmly secured together as a unit.

I am aware of the fact that at the present time, deflection yoke shells of the above mentioned type which are commercially available, are formed of thermosetting plastic material, such as for example, phenolic condensation products. Such shells are not entirely satisfactory because of the numerous attendant disadvantages, such as high cost, being relatively brittle and subject to rupture or cracking when connected together with permanent magnet segments strapp d in place thereon, or sometimes when the shells are accidentally dropped. Sometimes such shells become defective after they have been assembled with the magnets thereon and the coil therein in process of mounting on the neck of a cathode ray tube.

One of the objects of the present invention is to provide a novel and improved deflection yoke shell of the general character above indicatedwhich is relatively economical to manufacture, and which is durable in use, and which is not apt to easily rupture or fracture in handling or assembly or in mounting in operative position.

Another object is to provide a novel and improved shell of the character indicated which is capable of a substantial amount of distortion without rupture incident to assembly with other elements or in mounting in operative position.

A further object is to provide an improved shell of the character indicated comprising two identical, generally semi-cylindrical members formed of thermoplastic material, an assembly composed of a strip of insulatin material possessing heat and electrical insulating characteristics on which is fixedly secured a plurality of electrical terminal clips, and the assembly being rigidly attached to the inner wall of the annular chamber of the shell.

Other objects and advantages of this invention will be apparent from the following description, taken in connection with the accompanying drawing in which:

Figure 1 is a side sectional view of the shell embodying the present invention;

Figure 2 is an end elevational view of the shell with portions broken .struction;

Figure 3 is a vertical section through an assembled shell, taken substantially as indicated at line H on Fi ure 2;

Figure 4 is a view of the shell, part in section and part in side elevation, taken substantially as indicated at line 4-4 on Figure 2;

Figure 5 is an enlarged sectional view of the shell as indicated at line 5-! on Figure 2;

Figure 6 is a fragmentary, enlarged side elevational view of a portion of the exterior of the shell, taken as indicated at line H on Figure -2; and

Figure 7 is an enlarged sectional view taken at line l'| on Figure 3.

The shell embodying the present invention is composed of two identical, generally semi-tubular members indicated at II and II, adapted to be disposed in juxtaposed relation to form a generally tubular structure, and when so assembled, form at one end thereof, an open-ended annular chamber l2 and the opposite end being formed to provide an external annular groove ll. .Shells of the type embodying the present invention are adapted to have mounted in the groove a plurality of permanent magnets in the form of arouate segments, as indicated in dot and dash outline at ii in Figure 1. The permanent magnet segments are formed, on their inner wall, with a transverse groove constituting keyways for seating upon ribs or keys, as indicated at It, formed at the free edges of the respective shell members at the area constituting the groove ll so that the permanent magnet segments tend to lock themselves in position with respect to the shell, and the seating oi the magnets on the ribs l6 tend to lock the shell members II and ii, together in proper assembledrelation. The segments of permanent magnets are firmly held in clamped position in the groove in any conventional manner such as a metallic strip, as indicated in dot and dash outline at H.

The respective shell members each include a semi-annular wall 20, which, together, define the annular chamber l2, and the inner end of said wall is connected to a semi-annular, radially extending wall 2!, which constitutes a flange for the annular groove H. The extreme opposite ends of the members are formed with a-semiannular flange 22 which constitute the outer flange for the annular groove it. The abutting edges of the semi-circular walls 24 and semi-an-= away to show details of con- ,n'ular flanges :2 are provided withifite;

tongue and-groove f atures 24 and425 for;

i the two members t and u in assemble 1 v mam virtuezof. which, the terminal clips 3|. are veted to'the insulating strip 30 and the assembly then securedtolthe shell member. v 1'. 'I{o insure proper positioning' of the strip 80 carrying the clips with respect to the inner suring proper alignment and relative positioning of tion. i

I The-two shell members I and H are formed" face of the wall 20 of the'shell member, said of thermoplastic"material such as for example, V shellmember'isformedfwith an inwardly projectcellulose acetate, which permits substantial re-" ing nubbin 3fl with which registers an aperture duction in cost and eliminates the undesirable Y 38 ,formedin the strip 30, as clearly seen inv characteristic of extreme brittleness in presently Figures '3 and 'I of the drawing.

available shell structures of the general type Although'I have herein shown and-described above referred to. Thermoplastic materials are a preferred'embodiment of my invention, manirelatively pliable and flexible and permit a subfestly 'it' is' capable of modification and rearstantial amount of distortion without rupture, I rangement of; parts without departing from'the and therefore, reduce or substantially eliminate spirit and scope'thereof." I do not, therefore, all possibility of breakage incident to clamping wish to be understood as limiting this invention/ of permanent magnet segments in position in the t to the-precise form herein disclosed, except as I annular groove of the assembled shell. Furthermaybe so limitedby the appended claims. more, because the permanent magnet segmentsv I claim as my invention: currently employed are produced of powdered .20 1. A deflection yoke shell comprising a pair of metal, if an appreciable amount of distortion of 7 identical members of generally semi-cylindrical the Shell is not P d it frequently hap-' form, adapted to be assembled in cooperative repen th e permanent magnet en s belation to form an open-ended annular chamber come cracked and must be discarded a d m at one end and the exterior of the opposite end placed. being formed to constitute a flanged annular In using thermoplastic material to produce the groove for t receptionpf plurality of r ashell, mounting of electrical terminal clips on the t magnets therein; said members being shell p se t an important problem ause e formed of,thermoplastic material, a strip of mausual practice is to solder conductor wires to the terial of t and electrical insulating charmterminal p a hence th t resulting f m so teristics fitted. against the inner surface of the the soldering operation desirably should not be outer n of one f aid members, defining a transmitted to the shell formed of thermoplastic portion f Said 1 chamber, l ant of material as it would result in dlstoltmn and electrical terminal clips, rivets securing said clips deformation of the shell members. Considerable to said strip in Spaced apart l ti n, a d means damage thereto might result, to the extent neces- 5 for rigidly securing said assembly of t i a d, mating discarding of the Shell- Therefore is terminal clips to said wall of said one member. desirable that electricalterminal clips be mount- A deflection yoke 1 11 comprising a pair f ed with respect to the Shehih t and identical members of generally semi-cylindrical electrical insulated relation thereto; I For this form adapted to be assembled in cooperative Purpose I 9 asstmbly comprising a 40 lation to form an open-ended annular chamber strip 30 of Slutable msulatmg material having .at one end and the exterior of the opposite end both heat and ."electrical insulating characterisbeingformed constitutea fl n ed anmflar tics on which riveted, in spaced apart relaf groove for the reception-0f a plurality of perma q a a electrical terminal-flips ment magnets therein; said members being Such an assembly is then rigidly and firm formed of thermoplastic material, a strip of majached to the inner surface of the Wan m of terial of heat and electricalfinsulating characor as indicated by rivets 33. As may be seen in mission through the rivet 34, 1 preferably form each Shell h i so that the terminal cups teristics fitted againstthe inner surface of the disposed wlthm F annular chamber or outer wall of one of said members, defining a irri ateii tisuszittizreiiirs e a e y y 1 m electrical terminalclips, rivets securing said clips deslrable manner such as by g two to said strip in spaced apart relation, and means molded lugs or by means of a snap arrangement for rigidly securing said assembly of strip and terminal clips to said wall of said one member, said wall being formed with a plurality of apertures of a size greater than the heads of and registering with said rivets.

, 3. A deflection yoke shell comprising a pair of identical members of generally semi-cylindrical form, adapted to be assembled in cooperativerelation to form an open-ended annular chamber at one end and the exterior of the opposite end the drawing, each of the terminals 3| is rigidly attached to the strip 30 by means of a rivet 34, the outer, end of which would normally contact the inner surface of the wall 20 of -the shell member. To avoid transmission of heat to the shell member during the soldering operation in connecting a conductor wire to a clip by transthe wall 20 with a series of openings 35 in registration with each of the rivets associated with being formed to constitute." flanged annular Y of the drawings,

the cli 3|, and'w' 'ich openings are of a size groove for the recepthf'h Of a'plurahty of h as to in s ure'spaced elationship of the marginal hem? magnets therelll; id members being edges of the openings with respect to the head .6 fohmed thermhplastlc ma el a a-strip of mao the rivet as may be e Figures 5 and 5 terial of heat and electrical insulating characteristics fitted against the inner surface of the Although the terminal clips could be directlyv Outer Wall, f One of s m m ers, defining a porsecured to the wall 20 of the shell members in 1 of d annular ham r, a plurality f elecheat and electrical insulated relation thereto by trieal terminal ehps, ets sec r sa d clips the use of insulated bushings of the desirable o S d Str p in sp ce ap relation, Said Wall characteristics, through which a rivet extends, I- having an internally P j g n b n a pt prefer, however, to employ the constructional for se n in n rt re f rme in id strip arrangement herein disclosed for both economy o m urm pr per positioning of the strip in a in manufacture and simplicity of assembly, by desired circumferential relation to the-wall, and

means for rigidly securing said assembly of strip and terminal clips to said wall of said one memher.

4. A deflection yoke shell comprising a pair of identical members of generally semi-cylindrical form, adapted to be assembled in cooperative relation to form an open-ended annular chamber at one end and the exterior of the opposite end being formed to constitute a flanged annular groove for the reception of a plurality of permanent magnets therein; said members being formed of thermoplastic material, a strip of material of heat and electrical insulating characteristics fitted against the inner surface of the outer wall, of one of said members, defining a portion of said annular chamber, a plurality of electrical terminal clips, rivets securing said clips to said strip in spaced apart relation, said wall having an internally projecting nubbin adapted for seating in an aperture formed in said strip for insuring proper positioning of the strip in a desired circumferential relation to the wall, and means for rigidly securing said assembly of strip and terminal clips to said wall of said one member, said wall being formed with a plurality of apertures of a size greater than the heads of and registering with said rivets.

5. A deflection yoke shell comprising a pair of identical members of generally semi-cylindrical form, adapted to be assembled in cooperative relation to form an open-ended annular chamber at one end and the exterior of the opposite end being formed toconstitute a flanged annular groove for the reception of a plurality of permanent magnets therein; said members being formed of thermoplastic material, a plurality of electrical terminal clips, and means for securing said clips to the outer wall portions of said members, which form said chamber, in circumferentially spaced apart relation, and in heat and electrical insulated relation to said wall portions.

6. A deflection yoke shell comprising a pair of identical members of generally semi-cylindrical form, adapted to be assembled in cooperative relation to form a flanged annular groove, said members being formed of thermoplastic material, a strip of material of heat and electrical insulating characteristics fitted against the wall of one of said members. a plurality of electrical terminal clips, rivets securing ,said clips to said strip in spaced apart relation, and means for rigidly securing said assembly of strip and terminal clips to said wall of said one member, said wall being formed with a plurality of apertures of a size greater than the heads of and registering with said rivets.

7. A pair of identical generally semi-cylindrical members adapted to be assembled incooperative relation to form a flanged annular groove, said members being formed of thermoplastic material, a strip of material of heat and electrical insulated characteristics fitted against a surface of one of said members external of said annular groove, a plurality of electrical terminal clips, rivets securing said clips to said strip in spaced apart relation, and means for rigidly securing said assembly of strip and terminal clips to said surface of said one member.

ARNOLD P. HULTGREN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,207,777 Blain July 16, 1940 2,228,821 Hansen Jan. 14, 1941 2,443,025 De Tar June 8, 1948 2,501,516 Holden Mar. 21, 1950 

